package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.OrderBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WebSocketServer webSocketServer;


    /*
    * 用户下单
    * */
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        //处理各种业务异常(地址本，购物车数据为空)
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null){
            //地址为空
            throw new DeletionNotAllowedException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //查询购物车的数据
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list == null || list.size() == 0){
            //购物车为空，不能下单
            throw new DeletionNotAllowedException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //向订单表插入1条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPayStatus(Orders.UN_PAID);
        orders.setUserId(BaseContext.getCurrentId());
        orders.setOrderTime(LocalDateTime.now());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setAddress(addressBook.getDetail());

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        //向订单明细表插入n条数据
        for (ShoppingCart cart : list) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart,orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }

        orderDetailMapper.insertBatch(orderDetailList);

        //清空当前购物车的数据
        shoppingCartMapper.delete(BaseContext.getCurrentId());

        //封装VO返回数据
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        //因为没发支付，所以订单提交后自动付款
        paySuccess(orderSubmitVO.getOrderNumber());

        return orderSubmitVO;
    }
    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        Map map = new HashMap();
        map.put("type",1);
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号"+outTradeNo);

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /*
    * 历史订单查询
    * */
    public PageResult pageQuery4User(int page, int pageSize, Integer status) {
        //设置分页查询
        PageHelper.startPage(page,pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //开始查询数据
        Page<Orders> pageOrders =  orderMapper.pageQuery(ordersPageQueryDTO);

        //查询出订单明细，并封装入OrderVO进行响应
        List<OrderVO> list = new ArrayList<>();
        if(pageOrders != null && pageOrders.getTotal() >0){
            for (Orders pageOrder : pageOrders) {
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(pageOrder,orderVO);

                //订单明细
                Long orderId = pageOrder.getId();
                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);
                orderVO.setOrderDetailList(orderDetailList);

                list.add(orderVO);
            }
        }

        return new PageResult(pageOrders.getTotal(),list);
    }

    /*
    * 查询订单详情
    * */
    public OrderVO details(Long id) {
        //根据id获取订单数据
        Orders order = orderMapper.getById(id);

        //根据订单id查询明细表
        List<OrderDetail> byOrderId = orderDetailMapper.getByOrderId(id);
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(order,orderVO);
        orderVO.setOrderDetailList(byOrderId);

        return orderVO;
    }

    /*
    * 取消订单
    * */
    public void userCancelById(Long id) {
        //获取订单数据
        Orders orders = orderMapper.getById(id);

        //检查订单是否存在
        if(orders == null){
            throw new DeletionNotAllowedException(MessageConstant.ORDER_NOT_FOUND);
        }

        //分析订单状态，订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if(orders.getStatus() > 2){
            throw new DeletionNotAllowedException(MessageConstant.ORDER_STATUS_ERROR);
        }

        /*
        没实现支付功能
        // 订单处于待接单状态下取消，需要进行退款
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            //调用微信支付退款接口
            weChatPayUtil.refund(
                    ordersDB.getNumber(), //商户订单号
                    ordersDB.getNumber(), //商户退款单号
                    new BigDecimal(0.01),//退款金额，单位 元
                    new BigDecimal(0.01));//原订单金额

            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }*/

        //修改订单信息,更新订单状态、取消原因、取消时间
        Orders ordersTwo = Orders.builder()
                .status(Orders.CANCELLED)
                .cancelReason("用户取消")
                .cancelTime(LocalDateTime.now())
                .build();
        ordersTwo.setId(orders.getId());
        orderMapper.update(ordersTwo);

    }

    /*
    * 再来一单
    * */
    public void repetition(Long id) {
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        List<ShoppingCart> shoppingCartList = new ArrayList<>();

        for (OrderDetail orderDetail : orderDetailList) {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(orderDetail,shoppingCart);
            shoppingCart.setUserId(BaseContext.getCurrentId());
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartList.add(shoppingCart);
        }

        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /*
     * 订单管理接口
     * */
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOS = getOrderVOList(page);

        return new PageResult(page.getTotal(),orderVOS);
    }

    public List<OrderVO> getOrderVOList(Page<Orders> page){

        List<OrderVO> orderVOList = new ArrayList<>();
        List<Orders> ordersList = page.getResult();

        if(!CollectionUtils.isEmpty(ordersList)){
            for (Orders orders : ordersList) {
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

    /*
     * 各个状态的订单数量统计
     * */
    public OrderStatisticsVO statistics() {
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);

        return orderStatisticsVO;
    }

    /*
     * 接单
     * */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /*
     * 拒单
     * */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        // 根据id查询订单
        Orders orders = orderMapper.getById(ordersRejectionDTO.getId());
        // 订单只有存在且状态为2（待接单）才可以拒单
        if(orders == null || !orders.getStatus().equals(Orders.REFUND)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //支付状态
        Integer payStatus = orders.getPayStatus();
        if(payStatus.equals(Orders.PAID)){
            //用户已支付，需要退款
            log.info("已申请退款");
        }

        // 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders ordersTwo = Orders.builder()
                .id(orders.getId())
                .status(Orders.CANCELLED)
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .cancelTime(LocalDateTime.now())
                .build();

        orderMapper.update(ordersTwo);
    }

    /*
     * 取消订单
     * */
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        //根据id查询订单
        Long id = ordersCancelDTO.getId();
        Orders orders = orderMapper.getById(id);

        //支付状态
        if(orders.getPayStatus().equals(Orders.PAID)){
            log.info("已退单");
        }

        Orders ordersNew = Orders.builder()
                .status(Orders.CANCELLED)
                .id(id)
                .cancelReason(ordersCancelDTO.getCancelReason())
                .cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(ordersNew);

    }

    /*
     * 派送订单
     * */
    public void delivery(Long id) {
        Orders orders = orderMapper.getById(id);

        if(orders == null || !orders.getStatus().equals(Orders.CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders ordersNew = Orders.builder()
                .id(id)
                .status(Orders.DELIVERY_IN_PROGRESS)
                .build();

        orderMapper.update(ordersNew);
    }

    /*
     * 完成订单
     * */
    public void complete(Long id) {
        Orders orders = orderMapper.getById(id);

        if(orders == null || !orders.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders ordersNew = Orders.builder()
                .id(id)
                .status(Orders.COMPLETED)
                .deliveryTime(LocalDateTime.now())
                .build();

        orderMapper.update(ordersNew);
    }

    /*
    * 客户催单
    * */
    public void reminder(Long id) {
        Orders orders = orderMapper.getById(id);

        if(orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        Map map = new HashMap();
        map.put("type",2);
        map.put("orderId",id);
        map.put("content","订单号" + orders.getNumber());

        //通过webSocket向前端推送消息
        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }
}
